Hotels are overrated. Airbnb—the online marketplace for vacation rentals—is proving this as we speak, offering cooler and more unique living spaces for travelers at lower price ranges. Aside from listing everything from rooms to luxury suites, the service continues to expand its rental categories and has experienced a spike in growth in one area: tree houses. Believe it or not, but property owners across the globe are renting out their woodsy dwellings, giving out-of-townees an opportunity to live out their childhood fantasies in an eccentric, yet homely, setting. From resort-ready wooden pads to topiary shacks, climb up the latter and into a secret entrance as we put you on to the Coolest Treehouses to Rent on Airbnb.